WO2008107144A1

WO2008107144A1 - Clamping flange

Info

Publication number: WO2008107144A1
Application number: PCT/EP2008/001663
Authority: WO
Inventors: Dirk Warkotsch
Original assignee: Haweka Ag
Priority date: 2007-03-03
Filing date: 2008-03-03
Publication date: 2008-09-12
Also published as: DE102007010836A1; CA2679496A1; US20100170340A1; DE102007010836B4; EP2115416A1

Abstract

Disclosed is a clamping flange (1) that is designed to press a rim of a vehicle wheel against a flange of a shaft (8) of a balancing machine and comprises a clamping plate (2) which has a plurality of recesses (5) for accommodating centering bolts as well as a central breakthrough (6) to be slid onto the shaft (8) of the balancing machine. The centering bolts can be inserted into the clamping plate (2) on a front (7). The clamping flange (1) can be slid onto the shaft (8) while a clamping arrangement is provided for centering the clamping flange (1) on the shaft (8). According to the invention, the clamping arrangement encompasses a clamping sleeve (3) which is mounted in the central breakthrough (6) in such a way as to be movable in an axial direction relative to the clamping plate (2). Said clamping sleeve (3) can be moved and be brought into a clamping position by applying a pressure acting in an axial direction. In the clamping position, the clamping sleeve (3) is mounted without play on the shaft (8) and the clamping flange (1).

Description

clamping flange

The invention relates to a clamping flange adapted for pressing a rim of a vehicle wheel against a flange of a shaft of a balancing machine, with a plurality of recesses for receiving centering pins and a central opening for sliding onto the shaft of the balancing machine having clamping plate, wherein the centering on a front side can be inserted into the clamping plate, wherein the clamping flange can be pushed onto the shaft and wherein a clamping arrangement is provided for the centering of the clamping flange on the shaft.

Clamping devices for mounting wheels of different types of motor vehicles on a shaft of a balancing machine are known from the prior art. The known tensioning devices have a clamping flange with a central opening for the axial guidance of the rim of a vehicle wheel on the shaft. Furthermore, several groups of recesses for receiving centering bolts are arranged in the clamping flange. According to the hole arrangement in the rim of a vehicle wheel aufzuspannenden the centering pins are releasably fixed in a group of recesses. These centering pins engage with an end portion in the centering serving mounting holes in the rim of the vehicle wheel. By a patch on the shaft clamping nut, the vehicle or the rim with a back is brought to a fixed abutting flange of the balancing machine to the plant. By the abutment flange alignment of the rim takes place in a plane perpendicular to the axis of the balancing machine and by the engaging in the centering or mounting holes of the rim of the vehicle wheel centering takes place a radial centering.

From DE 38 08 755 Al a tensioning device of the type described above is known, which has a cone arrangement for centering the rim of the vehicle wheel on the shaft. In order to center the rims on the shaft, the conical arrangement is designed in the manner of a collet having an inner and an outer part, the outer part having an outer cylindrical surface for engaging in a centering bore in the rim of the driving wheel. has zeugrades. The inner and the outer part are arranged displaceable relative to each other, so that the inner part hangs free of play on the axle, while the cylindrical outer surface of the outer part of the collet comes clearance without play on the inner surface of the centering hole in the rim. Despite play-free and centered arrangement of the rim on the shaft of the balancing machine centering and balancing errors in the balancing process with the known clamping device can not be completely excluded.

Centering and balancing errors can also be due to an existing clearance between the clamping flange of the tensioning device and the shaft. From DE 103 31 129 Al a clamping flange for a clamping device is known, wherein a central opening in a clamping plate of the clamping flange is at least partially delimited by an elastically deformable wall portion of the clamping plate. This wall area also limits a pressure space which is filled with a fluid. By means of a likewise arranged in the pressure chamber and acting on the fluid adjustable pressure element, an internal pressure can be adjusted to the wall area in the pressure chamber. Depending on the internal pressure of this wall portion is elastically deformed, so that the wall area comes to the shaft without play on the system. This should be reduced centering and balancing errors due to a game between the clamping flange and the shaft. The deformation of the wall region takes place in the functional position or the centering position of the clamping flange, ie in a position arranged on the shaft. However, the deformation of the wall region of the known clamping flange is structurally complex and leads to high production costs of the clamping flange. Although the play between the clamping flange and the shaft can be reduced by the deformation of the wall area, but not completely avoided. Otherwise, the regulation of the internal pressure in the pressure space of the clamping flange, which is necessary for elastic deformation of the wall region, is complicated.

Object of the present invention is to provide a clamping flange of the aforementioned type, which is to avoid central and unbalance errors in the balancing process of a wheel even with different tolerances between the clamping flange and the shaft and even with increasing wear can be centered on the shaft without play. Moreover, it is an object of the present invention to provide a clamping flange available, which is structurally simple and allows a centering on the shaft in a simple manner and with high accuracy.

The aforementioned objects are achieved with a clamping flange of the type mentioned above in that the clamping arrangement has a clamping sleeve displaceably mounted in the central opening in the axial direction relative to the clamping plate, the clamping sleeve being displaceable by being acted upon by a compressive force acting in the axial direction a clamping position can be transferred and wherein the clamping sleeve is mounted in the clamping position without play on the shaft and on the clamping flange.

The invention is based on the basic idea, no longer make the centering of the clamping flange by a structurally and control technically complex deformation of the wall portion of the clamping plate in the region of the central recess, but to provide a relative to the clamping plate slidable clamping sleeve, through which a play-free mounting of the clamping flange on the shaft is effected in the clamping state of the clamping sleeve. The pressure force or clamping force required for displacement relative to the clamping flange can be applied to the clamping sleeve via a quick-release nut or the like.

By the clamping sleeve existing in the exemption of the clamping sleeve between the clamping flange and the shaft clearance in the clamping state is so far reduced that it can not come to balancing errors in the balancing process substantially. The term "backlash-free" also means a state in which the clearance between the clamping flange and the rail in the clamping state is reduced but not completely excluded in comparison to the existing clearance when the clamping sleeve is arranged in the release position. Preferably, however, when the clamping sleeve is arranged in the clamping position, no play exists at all.

The provided in the clamping state of the clamping sleeve play-free mounting of the clamping flange on the shaft means first that no play between the - A -

Clamping flange and the shaft is present. The invention allows in this context a substantially backlash-free axial displacement of the clamping flange in the circumferential direction. Preferably, however, it is provided that the clamping sleeve rests in the clamping state frictionally against the shaft. In frictional connection, any play between the clamping flange and the shaft can be excluded, with an axial displacement of the clamping flange relative to the shaft is no longer possible. As a result of the clamping sleeve, a permanent and easily controlled centering function of the clamping flange on the shaft is ensured even with different tolerances between the central recess in the clamping plate and the shaft and also with increasing wear of the clamping flange.

Moreover, the clamping sleeve can be releasably connected to the clamping flange, so that it can be replaced depending on the state of wear of the clamping sleeve. Moreover, the clamping sleeve can be made of a material having a high abrasion resistance. This ensures a permanent possibility for play-free fixing of the clamping flange on the shaft and centering.

In particular, there are a variety of ways to form the clamping flange according to the invention, reference being made on the one hand to the dependent claims and on the other hand to the following detailed description of a preferred embodiment of the invention. Show in the drawing

1 is a perspective view of a clamping flange according to the invention in an exploded view,

Fig. 2 of the clamping flange shown in Fig. 1 in a partially assembled

Status,

3 shows the clamping flange shown in FIG. 1 in a cross-sectional view in a state mounted on a shaft of a balancing machine, and FIG Fig. 4 is a clamping sleeve for setting and centering of the clamping flange shown in Fig. 1 on a shaft of a balancing machine.

In Fig. 1 is a perspective view of a clamping flange 1 with a clamping plate 2, a clamping sleeve 3 and a plurality of springs 4, wherein the clamping flange 1 for pressing a rim of a vehicle against a flange, not shown, of a shaft 8 shown in FIG a balancing machine is formed. For this purpose, a plurality of recesses 5 for receiving centering pins, not shown, and a central opening 6 for sliding onto the shaft 8 of the balancing machine are provided in the tensioning plate 2, wherein the centering pins can be inserted into the clamping plate 2 on a front side 7 of the clamping flange 1 and wherein the clamping sleeve 3 is the clamping part of a clamping arrangement, which is designed to set the clamping flange 1 on the shaft and for play-free centering of the clamping flange 1 on the shaft. The clamping sleeve 3 is displaceable in the axial direction to the clamping plate 2 and mounted on the clamping plate 2, wherein the clamping flange 1 in an exemption of the clamping sleeve 3 with the clamping sleeve 3 playfully pushed onto the shaft 8 is bar. By applying the clamping sleeve 3 with a compressive force can move them in the axial direction relative to the clamping plate 2 and transfer into a clamping position, the clamping sleeve 3 with a radial clamping portion at the front end of the clamping sleeve 3 in the clamping position without play abuts against the shaft 8 and, preferably, a frictional connection with the shaft 8 is formed. This will be discussed in detail below.

As is apparent in particular from Fig. 3, the clamping sleeve 3 is slidably inserted in the assembled state of the clamping flange 1 in the central aperture 6 and mounted on the clamping plate 2, wherein the clamping flange 1 is pushed with the clamping sleeve 3 on the shaft 8 of the balancing machine. In Fig. 3, the clamping sleeve 3 is in the exemption, with the clamping flange 1 in the axial direction with a game on the shaft 8 to move and rotate about the shaft 8. On the front side 7 of the clamping flange 1, a coaxial with the central opening 6 arranged annular centering extension 9 of the clamping plate 2 is provided as a guide for the clamping sleeve 3. In this case, the clamping sleeve 3 is slidably mounted in the centering extension 9, so that the clamping sleeve 3 can be moved by applying a pressing force of the release shown in Fig. 3 relative to the clamping plate 2 in a clamping position. In Fig. 4, the clamping sleeve 3 is shown in a cross-sectional view.

The clamping sleeve 3 has a plurality of clamping legs 10, wherein the clamping legs 10 rest in the clamping position of the clamping sleeve 3 without play on the shaft 8. In the described embodiment, it is provided that the clamping legs 10 frictionally rest in the clamping position of the clamping sleeve 3 against the shaft 8, so that any play between the clamping flange 1 and the shaft 8 is excluded in the clamping state. In the clamping position, the clamping flange 1 can then no longer be displaced in the axial direction relative to the shaft 8 or rotate about the shaft 8. In the release, however, there is no frictional connection between the shaft 8 and the clamping flange 1, so that it can move easily in the axial direction on the shaft 8 or rotate. At this point, it should be noted that it is not absolutely necessary that the clamping legs 10 create a friction fit against the shaft 8 in the clamping state.

The clamping legs 10 extend starting from a provided at a rear end of the clamping sleeve 3 ring member 11 in the axial direction forward to the front side 7 of the clamping flange 1. The ring member 1 1 has a greater wall thickness than the clamping legs 10, wherein the clamping legs 10th This results in that the clamping legs 10 act as a spring leg, the clamping legs 10 automatically spring back when releasing the clamping sleeve 3 with the clamping force of a clamping position in an exemption. After relieving the clamping sleeve 3, the clamping flange 1 can therefore be easily moved back on the shaft 8 or removed from the shaft 8, wherein the spring back of the clamping legs 10 in the exemption to an increase in the game between the clamping flange 1 and the shaft 8 leads. The clamping legs 10 are arranged equidistantly over the circumference of the clamping sleeve 3, wherein adjacent clamping legs 10 are separated by axially extending slot-shaped and bulged in the central region recesses 14 from each other. The distribution of the clamping legs 10 over the circumference of the clamping sleeve 3 leads to a self-centering of the clamping flange 1 on the shaft 8 when transferring the clamping sleeve 3 in the clamping position, each clamping leg 10 abuts in the near-end region 13 against the shaft 8.

Each clamping leg 10 has at its free end a play-free abutment against the shaft 8 in the clamping state formed inner surface 15. The inner surface 15 extends in the axial direction substantially parallel to the longitudinal side of the shaft 8 and is circularly bent in the circumferential direction to allow a largely play-free abutment against a lateral surface 15a of the shaft 8 in the clamping state. In addition, a sufficient holding force for forming a frictional connection with the shaft 8 in the clamping state can be transmitted via the inner surface 15.

When unscrewing a clamping nut, not shown on the shaft 8 of the balancing machine of the clamping flange 1 is inserted into the recesses 4 of the clamping plate 2 inserted centering against the rim of a balanced vehicle wheel, the rim between a flange of the shaft 8 of the balancing machine and with the clamping plate 2 connected centering pin is clamped. For centering the rim on the shaft 8, the centering means described above can be provided. When the rim of the vehicle wheel is applied by means of the centering bolt against the flange of the shaft 8 of the balancing machine, the quick release is further screwed onto the shaft 8, which leads to an increase of the clamping force. As a result, the clamping sleeve 3 is pressed against the spring force of the springs 4 in the direction X relative to the clamping plate 2 forward. In the release of the clamping sleeve 3 shown in Fig. 3, there is initially a distance between a conical outer surface 16 of each clamping leg 10 and a complementarily shaped conical inner surface 17 the centering extension 9. With increasing advancement of the clamping sleeve 3, the conical surfaces move 16, 17th towards each other and finally come into positive contact. Due to the conical surfaces 16, 17 a further advancement of the clamping sleeve 3 to a compression of the clamping sleeve 3 in the front region and thus to a reduction of the clearance between the inner surfaces 15 of the clamping legs 10 and the lateral surface 15a of the shaft 8 until the inner surfaces 15 of the clamping legs 10 positively against the lateral surface 15a the wave 8 abut. As a result, the clamping flange 1 is centered via the clamping sleeve 3 on the shaft 8 without play. Depending on the strength of the Aufspannkraft it comes with further increase in the clamping force finally to form a frictional connection between the inner surfaces 15 and the lateral surface 15a of the shaft 8. This is an absolutely backlash centering of the clamping flange 2 on the shaft 8 of the balancing machine achieved what clearly supports the centering of the wheel to be balanced.

The spring force of the springs 4, which are provided as a spring means causes the clamping sleeve 3 is pushed away from the clamping force against the direction X of the clamping plate 2 and released automatically from the clamping position in the release shown in FIG. 3 in relief, so that the clamping flange 1 can be deducted from the shaft 8 in a simple manner. The clamping sleeve 3 is held against the spring force of the springs 4 at two abutments 18 of the centering extension 9 in the axial direction. The abutment 18 serve to limit the spring travel of the springs 4 with relief of the clamping sleeve 3 of the clamping force and act as anti-rotation for the clamping sleeve. 3

The slot-shaped recess 14 between two adjacent clamping legs 10 forms a guide section for an abutment 18, wherein the recess 14 has a cross-sectional taper 19 at the outer end of the central region 12 of the adjacent clamping legs 10 and wherein each abutment 18 against two adjacent clamping legs 10 in the loading rich of the cross-sectional taper 19 is applied. The abutments 18 are formed by bolts inserted from outside on opposite sides through the centering extension 9 into the area of the central opening 6. In principle, it is also possible that the bolts are screwed in, which makes it possible for the clamping sleeve 3 depending on the state of wear as required by the clamping flange 1 to solve and exchange. On a rear side 20 of the clamping flange 2, the clamping sleeve 3 has an annular flange 21, wherein the annular flange 21 has an outer bearing surface 22 for a contact surface of a clamping nut. On the back 20 of the clamping flange 1, a coaxial with the central aperture 6 arranged annular projection 23 is provided, wherein the projection 23 an annular recess 24 in the clamping plate 2 with a contact surface 25 for an inner surface 26 of the annular flange 21 is formed. The springs 4 are arranged uniformly distributed in the region of the recess 24 over the circumference of the recess 24 and inserted into blind holes 27 of the clamping plate 2.

As is apparent from Fig. 3, the annular flange 21 is kept in the release by the springs 4 to form an annular gap at a distance from the contact surface 25. The annular flange 21 is slidably received in the recess 24 in the axial direction. The distance between the inner surface 26 of the annular flange 21 and the contact surface 25 of the clamping plate 2 determines the maximum displacement by which the clamping sleeve 3 in the direction X can be moved forward under the action of a clamping force. As is apparent from a comparison of the distance between the inner surface 26 and the contact surface 25 on the one hand and the distance between the conical outer surface 16 and the conical inner surface 17 on the other hand, it is not for backlash-free centering of the clamping flange 1 on the shaft 8 in the rule required to move the clamping sleeve 3 to the maximum displacement forward.

Moreover, the invention makes it possible, if necessary, to combine the features mentioned in the claims and / or the features disclosed with reference to the drawing and features described above, even if this is not described in detail. The invention is not limited to the illustrated and described embodiment of the clamping flange 1.

Claims

claims:

1. clamping flange (1) adapted for pressing a rim of a vehicle wheel against a flange of a shaft (8) of a balancing machine, with a plurality of recesses (5) for receiving centering bolts and a central opening (6) for sliding onto the shaft ( 8) of the balancing machine having clamping plate (2), wherein the centering pins on a front side (7) in the clamping plate (2) can be inserted, wherein the clamping flange (1) on the shaft (8) can be pushed and wherein a clamping arrangement for centering the clamping flange (1) on the shaft (8) is provided, characterized in that the clamping arrangement in the central opening (6) in the axial direction relative to the clamping plate (2) slidably mounted clamping sleeve (3), wherein the clamping sleeve (3 ) is displaceable by acting with a compressive force acting in the axial direction and in a clamping position can be transferred and wherein the clamping sleeve (3) in the clamping position spielfre i is mounted on the shaft (8) and on the clamping flange (1).

2. clamping flange according to claim 1, characterized in that on the front side (7) of the clamping plate (2) has a coaxial with the central opening

(6) arranged annular centering extension (9) is provided as a guide for the clamping sleeve (3).

3. clamping flange according to claim 1 or 2, characterized in that the clamping sleeve (3) has a plurality of clamping legs (10) and that the clamping legs (10) in the clamping position of the clamping sleeve (3) at least partially free of play against the shaft (8) issue.

4. clamping flange according to claim 3, characterized in that the clamping legs (10) starting from a ring part (1 1) of the clamping sleeve (3) in the axial direction to the front (7) of the clamping flange (1).

5. clamping flange according to one of the preceding claims 3 or 4, characterized in that the clamping legs (10) equidistantly over the circumference of the clamping sleeve (3) are arranged and that adjacent Clamping legs (10) are separated by axially extending slot-shaped recesses (14).

6. clamping flange according to one of the preceding claims 3 to 5, characterized in that the clamping leg (10) at its free end an inner surface (15) for play-free abutment against the shaft (8) in the clamping position.

7. clamping flange according to one of the preceding claims 3 to 6, characterized in that each clamping leg (10) has a conical outer surface

(16) for play-free abutment against a conical inner surface (17) of the centering extension (9) in the clamping position.

8. Clamping flange according to one of the preceding claims, characterized in that at least one on the clamping plate (2) supported and against the clamping sleeve (3) acting spring means is provided.

9. clamping flange according to claim 8, characterized in that the clamping sleeve (3) against the spring force of the spring means on at least one wiper bearing (18) of the centering extension (9) is held in the axial direction.

10. Clamping flange according to claim 9, characterized in that the slot-shaped recess (14) between adjacent clamping legs (10) forms an axial guide for the abutment (18), wherein the recess (14) has a cross-sectional taper (19) and wherein the abutment (18) rests in the free position of the clamping sleeve (3) against two adjacent clamping legs (10) in the region of the cross-sectional taper (19).

1 1. clamping flange according to one of the preceding claims 9 or 10, character- ized in that at least two abutments (18) are provided and that the abutment (18) through from outside on opposite sides by the centering extension (9) through in the area the central opening (6) inserted bolts are formed.

12. clamping flange according to one of the preceding claims, characterized in that the clamping sleeve (3) on a rear side (20) of the clamping flange (1) has an annular flange (21), wherein the annular flange (21) has an outer bearing surface (22) for a contact surface of a screwed onto the shaft of the balancing machine clamping nut.

13. clamping flange according to claim 12, characterized in that a plurality of against the clamping plate (2) supported and against the annular flange (21) acting spring means is provided.

14. Clamping flange according to one of the preceding claims 12 or 13, character- ized in that the clamping plate (2) on the back (20) of the

Clamping flange (1) has a coaxial with the central opening (6) arranged annular projection (23), wherein by the projection (23) has an annular recess (24) with a contact surface (25) for an inner surface (26) of the annular flange (21) is formed.

15. Clamping flange according to claim 14, characterized in that the inner surface (26) of the annular flange (21) in the exemption of the clamping sleeve (3) from the contact surface (25) of the recess (24) is spaced to form an annular gap.

16. clamping flange according to claim 14 or 15, characterized in that the spring means in the region of the recess (24) are arranged and equidistant in the circumferential direction.